Valve-stem packing.



PATENTED AUG, 25,1903. 0. F. MoGOMAS. VALVE STEM PACKING.

APPLICATION FILED JUNE 3, 1903.

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INVENTOR %(0/17'00. By 9. 6%

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UNITED STATES Patented August 25, 1903.

CHARLES F. MCCOMAS, OF DENISON, TEXAS.

VALVE-STEM PACKING.

QPEGIFICATION forming part of Letters Patent No. 737,447, dated August 25, 1903.

Application filed June 3,1903. $B1ial No. 159,959. (No model.)

To all whom, it may concern:

Be it known that I, CHARLES F. MOCOMAS, a citizen of the United States, residing at Denison, in the county of Grayson and State of Texas, have invented new and useful Improvements in Valve-Stem Packing, of which the following is a specification.

This invention relates to a valv e-stem packing for locomotives and other steam-engines,

and embodies an organization of elements which are so arranged as to permit air to freely pass into the steam-chest to fulfil the office of a relief-valve and also reduce wear and prolong the life of the packing. The improved packing can be easily and cheaply applied and readily removed when worn out and will require less attention than the ordinary fibrous or metallic packings.

The invention consists in the construction and arrangement of the several parts, which will be more fully hereinafter described and claimed.

The drawing illustrates a longitudinal vertical section of a part of a steam-chest, stuffing-box, and valve-rod, showing the improved packing applied thereto.

The numeral 1 designates a stuffing-box connecting with one end 2 of a steam-chest, the said stuffing-box having a packing-chamber 3 formed therein, terminating at one end in a shoulder 4. A valve rod or stem 5 is reciprocatingly mounted in the stufling-box and moves through an opening 6 in the one end or head 3 of the steam-chest, said opening being of great-er diameter than the valverod 5. Slidingly mounted in the chamber 3 is a bull-ring 7, which is unattached to any part of the valve'rod 5 and has an opening 8 therethrough of materially greater diameter than the diameter of said rod. At regular intervals packing-rings 9 are disposed in circumferential grooves 10 in the bull-ring for obvious purposes. The valve-rod 5 at an intermediate point has a screw-threaded portion 11, which is engaged by a stop-collar 12, held against movement by a j am-nut 13. The one end of the bull-ring 7 strikes against or contacts with the stop-ring 12, and the opposite end of said ring is adapted to engage the I shoulder 4.

The operation of the improved packing is as follows: When steam is admitted into the steam-chest, the bull-ring '7 is forced back against the collar 12, forming a steam-tight joint, the packing-rings 9 reliably contributing to the formation of such joint. WVhen steam is shut off and the engine is drifting, a vacuum is formed in the steam-chest, and atmospheric pressure coming into the stuffingbox forces the bull-ring 7 against the shoulder 4, and said ring will remain in this position until steam is again admitted to the steamchest. This action allows air to freely pass into the steam-chest, and the improved packing thus practically fulfils the office of a relief-valve, the bull-ring and packing -rings being at rest or temporarily out of service. As the bull-ring does not contact with the valve-rod 5, the latter is not Worn, and, moreover, the packing as constructed in accordance with the present invention will require little, if any, attention.

The most important advantage of the pres= ent construction is that the improved pack ing will serve as a valve rod or stem packing when using steam and as a relief-valve when steam is shut off.

Changes in the proportions and dimensions, as well as the minor details, may be resorted to to accommodate various applications without departing from the spirit of the invention.

Having thus fully described the invention, what is claimed as new is- 1. A packing, comprising a stuffing-box with a chamber therein, a bull-ring freely slidalole in the chamber, a valve rod extend= ing through the bull-ring and out of contact therewith, and stop devices to limit the move ment of the bull-ring, the latter serving as a valve-rod packing, when using steam, and as a relief-valve when steam is shut ofi.

2. A packing, having a movable element therein, a valve-rod extending through and out of contact with said element, and means for limiting the movement of the element, the said means serving as a rod-packing, when using steam, and as a relief-valve When steam ment, and a Valve-rod, said element serving 10 is shut off. as a packing for the rod when using steam,

3. A packing, comprising a stufling-box, a and as a relief-valve when steam is shut off. valve-rod. extending therethrough, the latter In testimony whereof I affix my signature and the stuffingbox being provided with in presence of two witnesses. stop means, and a slidable element Within the v I CHARLES F. MOCOMAS. stuffing-box and out of contact with relation Witnesses: to the valve-rod. O. E. PECK,

4. A packing, comprising a movable ele- O. H. HARDING. 

